Most Shooters Have Multiple Guns In Multiple Calibers. Now You Can Sight In All Of Your favorites Guns With The NcStar Cartridge Laser Bore Sighter Set. We've Included The Most Popular Caliber Sizes including .223 Rem., .308 Win., 30-06 SPRG., And 7mm Rem Mag. With This Set You Can Bore Sight Up To 20 Calibers! Each Cartridge Laser Bore Sighter operates independently So You Don't Have To Worry About using arbors. Includes Carry Case With Belt Loop Plus 4 sets Of Batteries. Get On Paper The Quick And Easy Way!